TXT - Plain Text File contains unformatted text. It cannot contain pictures, tables, video or anything besides text. Most word processing and spreadsheet programs can open TXT files regardless of the hardware platform, including some eReaders. Users can create TXT files in Notepad on Windows PCs or in TextEdit on Mac, or save files as TXT with programs such as Microsoft Word or Excel or similar programs such as those in Open Office. Mac applications typically use the extension TEXT rather than TXT, but the two file types function the same way.